It's not every day you get a chance to get even with a regular customer who each time they come to eat at your restaurant, is determined to complain until they get their meal comped… Back when I was a waitress, I certainly didn't bump into customers too much outside of work (thankfully). This regular customer in question came to the corporate-style cookie-cutter restaurant that the OP was working at. She would arrive with a frown, eat lunch, and never tip. It was the same thing, every single ti…